RWM Casters 30 Series Plate Caster, Rigid, Phenolic Wheel, Ball Bearing, 575 lbs Capacity, 6" Wheel Dia, 1-1/2" Wheel Width, 7-3/8" Mount Height, 4-1/4" Plate Length, 3-3/4" Plate Width 7-3/8" Overall height, 1-3/8" swivel lead, 575lbs capacity Durastan wheel with ball bearing 2-3/8" x 3-7/16" slotted to 3" x 3" bolt hole spacing for 3/8" diameter bolt Dual heat treated raceways staked with a 5/8" diameter kingpin Zinc plated to protect against corrosion